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udevd: in case we don't daemonize, send READY message to /sbin/init

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This commit is contained in:
Kay Sievers 2010-06-17 21:50:58 +02:00
parent 2da64971fd
commit a65aa40f8a
1 changed files with 78 additions and 0 deletions
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78
udev/udevd.c
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@ -34,6 +34,7 @@
#include <sys/time.h>
#include <sys/prctl.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/signalfd.h>
#include <sys/select.h>
#include <sys/poll.h>
@ -950,6 +951,81 @@ static int mem_size_mb(void)
return memsize;
}
static int init_notify(const char *state)
{
int fd = -1, r;
struct msghdr msghdr;
struct iovec iovec;
struct ucred *ucred;
union {
struct sockaddr sa;
struct sockaddr_un un;
} sockaddr;
union {
struct cmsghdr cmsghdr;
uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
} control;
const char *e;
if (!(e = getenv("NOTIFY_SOCKET"))) {
r = 0;
goto finish;
}
/* Must be an abstract socket, or an absolute path */
if ((e[0] != '@' && e[0] != '/') || e[1] == 0) {
r = -EINVAL;
goto finish;
}
if ((fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0)) < 0) {
r = -errno;
goto finish;
}
memset(&sockaddr, 0, sizeof(sockaddr));
sockaddr.sa.sa_family = AF_UNIX;
strncpy(sockaddr.un.sun_path, e, sizeof(sockaddr.un.sun_path));
if (sockaddr.un.sun_path[0] == '@')
sockaddr.un.sun_path[0] = 0;
memset(&iovec, 0, sizeof(iovec));
iovec.iov_base = (char*) state;
iovec.iov_len = strlen(state);
memset(&control, 0, sizeof(control));
control.cmsghdr.cmsg_level = SOL_SOCKET;
control.cmsghdr.cmsg_type = SCM_CREDENTIALS;
control.cmsghdr.cmsg_len = CMSG_LEN(sizeof(struct ucred));
ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr);
ucred->pid = getpid();
ucred->uid = getuid();
ucred->gid = getgid();
memset(&msghdr, 0, sizeof(msghdr));
msghdr.msg_name = &sockaddr;
msghdr.msg_namelen = sizeof(struct sockaddr_un);
msghdr.msg_iov = &iovec;
msghdr.msg_iovlen = 1;
msghdr.msg_control = &control;
msghdr.msg_controllen = control.cmsghdr.cmsg_len;
if (sendmsg(fd, &msghdr, MSG_NOSIGNAL) < 0) {
r = -errno;
goto finish;
}
r = 0;
finish:
if (fd >= 0)
close(fd);
return r;
}
int main(int argc, char *argv[])
{
struct udev *udev;
@ -1201,6 +1277,8 @@ int main(int argc, char *argv[])
rc = 0;
goto exit;
}
} else {
init_notify("READY=1");
}
/* set scheduling priority for the main daemon process */